I have 13 types here. Some need a good 3 years of just sitting in ground before they bloom. Some bloom off of old wood, so if you pruned them, you will have to wait 2 years. There are mainly 3 classes of them, and each has to be treated slightly different from each other and not all are effected by the PH soil. I am not in front of my book right now, so really don't want to continue from memory. And I rarely fertilize them, or anything. Maybe every 3 years, I will throw out a general 0-10-0 fertilizer to everything. (and that is a maybe).